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Reconciliation of Weighted Average Shares Outstanding and Share Repurchases (Details) - $ / shares	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Reconciliation of Weighted Average Shares Outstanding and Share Repurchases [Abstract]
Weighted average shares outstanding (in shares)	57,170,000	57,434,000	57,123,000	57,624,000
Less: Unvested restricted shares (in shares)	(135,000)	(210,000)	(144,000)	(219,000)
Shares used for basic earnings per share (in shares)	57,035,000	57,224,000	56,979,000	57,405,000
Dilutive effect of stock options and other stock awards (in shares)	836,000	788,000	757,000	776,000
Shares used for diluted earnings per share (in shares)	57,871,000	58,012,000	57,736,000	58,181,000
Shares repurchased (in shares)	0	300,000	600,000	700,000
Average purchase price (in dollars per share)		$ 55.14	$ 53.12	$ 52.74
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	0	100,000
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)			100,000	100,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)	0	300,000
Stock Options [Member] | Class A Common [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from diluted EPS calculation (in shares)			300,000	300,000

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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